Prof. Plum in the library with a candlestick...

hellblau · 8th January 2004, 05:01 AM

Hi to everybody!
I'm not trying to start a "Cluedo" match, but to find a clue...

The little PCB you see is a "B&W Hi-pass alignment filter", originally shipped with a pair of B&W loudspeakers (model 805) I owned in the nineties.

While making some Frankestein-style experiment with the power supply (that I completely re-made), I connected the PCB in the wrong way (i.e.: "+ power supply wire" to the "-" in the PCB).

And now, of course, it is completely dead. (Murphy's law?)

What component is likely to have failed? Capacitor? Relay?

Please help...!

hellblau · 8th January 2004, 05:04 AM

The backside of the PCB...

dhaen · 8th January 2004, 07:04 AM

1 or more of the transistors.

Check each with a meter for short or open circuit.
There will be 2 or more different types, so don't forget their locations and orientations.

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8th January 2004, 07:04 AM	#3
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	1 or more of the transistors. Check each with a meter for short or open circuit. There will be 2 or more different types, so don't forget their locations and orientations.